View Compilation Error

0_0_25049310_4253.cpp:2:1: error: expected unqualified-id before numeric constant
 2.using namespace std;  
 ^
0_0_25049310_4253.cpp:3:1: error: expected unqualified-id before numeric constant
 3.const double eps(1e-8);  
 ^
0_0_25049310_4253.cpp:4:1: error: expected unqualified-id before numeric constant
 4.typedef long long ll;  
 ^
0_0_25049310_4253.cpp:5:1: error: expected unqualified-id before numeric constant
 5.const long double pi = acos(-1.0);  
 ^
0_0_25049310_4253.cpp:6:1: error: expected unqualified-id before numeric constant
 6.  
 ^